Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 1 FIGURE 7–1 A rule showing that the larger the division, the longer the line.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 2 FIGURE 7–2 A plastic rule that has both inches and centimeters. Each line between the numbers on the centimeters represents 1 millimeter because there are 10 millimeters in 1 centimeter.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 3 FIGURE 7–3 A typical micrometer showing the names of the parts. The sleeve may also be called the barrel or stock.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 4 FIGURE 7–4 All micrometers should be checked and calibrated as needed using a gauge rod.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 5 FIGURE 7–5 The three micrometer readings are (a) in.; (b) in.; (c) in. These measurements used the vernier scale on the sleeve to arrive at the ten-thousandth measurement. The number that is aligned represents the digit in the ten-thousandth place.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 6 FIGURE 7–6 Metric micrometer readings that use the vernier scale on the sleeve to read to the nearest millimeter. The arrows point to the final reading for each of the three examples.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 7 FIGURE 7–7 Using a micrometer to measure the connecting rod journal for out-of-round and taper.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 8 FIGURE 7–8 Crankshaft journal measurements. Each journal should be measured in at least six locations, but also in position A and position B and at 120-degree intervals around the journal.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 9 FIGURE 7–9 Camshaft journals should be measured in three locations, 120 degrees apart, to check for out-of-round.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 10 FIGURE 7–10 Checking a camshaft for wear by measuring the lobe height with a micrometer.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 11 FIGURE 7–11 When the head is first removed, the cylinder taper and out-of-round should be checked below the ridge (a) and above the piston when it is at the bottom of the stroke (b).

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 12 FIGURE 7–12 (a) A telescopic gauge being used to measure the inside diameter (ID) of a camshaft bearing. (b) An outside micrometer used to measure the telescopic gauge.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 13 FIGURE 7–13 Cutaway of a valve guide with a hole gauge adjusted to the hole diameter.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 14 FIGURE 7–14 The outside of a hole gauge being measured with a micrometer.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 15 FIGURE 7–15 (a) A typical vernier dial caliper. This is a very useful measuring tool for automotive engine work because it is capable of measuring inside, outside, and depth measurements. (b) To read a vernier dial caliper, simply add the reading on the blade to the reading on the dial.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 16 FIGURE 7–16 A group of feeler gauges (also known as thickness gauges), used to measure between two parts. The long gauges on the bottom are used to measure the piston-to-cylinder wall clearance.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 17 FIGURE 7–17 A feeler gauge, also called a thickness gauge, is used to measure the small clearances such as the end gap of a piston ring.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 18 FIGURE 7–18 A straightedge is used with a feeler gauge to determine if a cylinder head is warped or twisted.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 19 FIGURE 7–19 A dial indicator is used to measure valve lift during flow testing of a high-performance cylinder head.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 20 FIGURE 7–20 A dial bore gauge is used to measure cylinders and other engine parts for out-of- round and taper conditions.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 21 FIGURE 7–21 A depth micrometer being used to measure the height of the rotor of an oil pump from the surface of the housing.